build(deps): update @google/gemini-cli-core to ^0.1.12

- Update gemini-cli-core dependency to latest version
- Refactor imports in chatwrapper.ts to use direct module imports
- Change auth type to use string literal 'oauth-personal'

package.json

@@ -26,7 +26,7 @@
   "license": "MIT",
   "description": "",
   "dependencies": {
-    "@google/gemini-cli-core": "^0.1.7",
+    "@google/gemini-cli-core": "^0.1.12",
     "consola": "^3.4.2",
     "dotenv": "^17.0.0",
     "zod": "^3.25.67"